nested 循环

MATLAB允许在另一个循环中使用一个循环。 以下部分显示了几个例子来说明这个概念。

语法 (Syntax)

MATLAB中嵌套for循环语句的语法如下 -

for m = 1:j
   for n = 1:k
      <statements>;
   end
end

MATLAB中嵌套while循环语句的语法如下 -

while <expression1>
   while <expression2>
      <statements>
   end
end

例子 (Example)

让我们使用嵌套的for循环来显示从1到100的所有素数。创建一个脚本文件并键入以下代码 -

for i = 2:100
   for j = 2:100
      if(~mod(i,j)) 
         break; % if factor found, not prime
      end 
   end
   if(j > (i/j))
      fprintf('%d is prime\n', i);
   end
end

运行该文件时，它显示以下结果 -

2 is prime
3 is prime
5 is prime
7 is prime
11 is prime
13 is prime
17 is prime
19 is prime
23 is prime
29 is prime
31 is prime
37 is prime
41 is prime
43 is prime
47 is prime
53 is prime
59 is prime
61 is prime
67 is prime
71 is prime
73 is prime
79 is prime
83 is prime
89 is prime
97 is prime